2080100

Appears in sequences

• Expansion of (1+x)^2/(1-18*x+x^2).at n=5A004292
• Numerators of continued fraction convergents to sqrt(45).at n=14A041076
• Numerators of continued fraction convergents to sqrt(405).at n=4A041768
• Number of n X 2 binary arrays with all 1s connected, a path of 1s from upper left corner to lower right corner, and no 1 having more than two 1s adjacent.at n=29A163685